Color photography.



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rnainr-r. rrrr contra or selective absorptionproperties and secured to a suitable support to form grained screens in the well known manner.

My object. is to provide a process for producing such grains or particles of suitable minute size and in apractical, speedy and cfiicacious manner.

in my improved process, ll preferably first form exceedingly fine filaments or fibers of celluloid, collodion, or other suitable colorless substance, from a solution oi the same. For example, collodion or celluloid may be insulation in aniyl acetate. Fibers or fila- \ueuts may be producedtrom this solution in a numbcrof Ways. For example, the method described in the patent to Wil l. Morton, No. 705,691, for method of dispersion; fluids, patent-ed July 29, 1902, may be utilized. lln this process, the composite fiuid, such as the solution referred to, is delivered in a thin film or othcr'attenuated form into an electrically polarized atmospheric field produced by the convective passage through an atmospheric medium of an electric current oi high tension. I Any suitable source of high tension or static electricity maybe used. The dis charge of the celluloid into this field may be through a capillary tube. The result is the separation and evaporation of the volatile component of the fluid, which would be the solvent, and the simultaneous solidification of the fixed component in the form oi fine fibers or filaments. Fibers or filaments can likewise be produced from a solution by other means as in a centrifugal machine, or by squirting the solution through a fine aperture in the ell known manner.

The mass of fiber produced in Whatever manner is. collected and rendered temporarily brittle in thepreterred form of my invention, as by sub ecting it to intense cold. This may be done by subjecting it to an atmosphere of liquid air vapor. While in the brittle condition induced by the cold, the

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fibers crushed to powder in any suitable apparatus. The n iuute particles so produced are sifted to size and those of suitable size may be rolled in a mill, if desired, to a spherical sllape. l .ther this is done or not, they are dyed in the three colors necessary to give the proper light selective absorption properties, and equal. numbers of the particles of the three colors are then dis gether. and flattened it necessary, to fill up all interstices, or otherwise treated to form a grainral screen according to processes Well known in color photography.

Having now described my invention, What l-clainr and desire to protect by Letters Patent is as tollovvsi l. The process of forming grained screens for use in photographic processes consisting in exposing in attenuated storm a supply of composite fluid having volatile and fixed components tothc convective action of'high tension electricity and disrupting" the same thereby, setting the component of fixed substances u'liile in a fine filamentous condition, subjecting the filaments or fibers so produced to intense cold. crushing the same to powder While in the brittle condition caused by the cold, sitting the grains so produced to size, imparting to the grains different light selective absorption properties, distributing; said grains in a layer on. a support and binding them together, substantially as described. y y

2. The process of forming grained screens for use in photographic processes consisting in exposing in attenuated form a supply of composite fluid having volatile and tired components to the convective action of high tension electricity and disrupting the same thereby, setting; the component 01 fixed substances while in a fine filamentous condition, reducing the filaments or fibers so produced to powder, sitting the grains so produced to size, imparting to the grains ditlerentlight selective absorption properties, distributing said grains in a layer on a support and binding them together, substantially as do scribed.

3. The process of forming grained screens for use in photographic irocesses consisting), in exposing in attcnuatec form a supply of composite fiuid having; volatile and fixed components to the convective action of high tension electricity and disrupting the same tlti till

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thereby, setting the component of fixed substances whilein a fine filamentous condition, rendering the filaments or fibers so produced temporarily exceedingly brittle, crushing the same to powder while brittle, sifting the grains so reduced to size, imparting to the grains di 'crent light selective absorption properties, distributing said grains in a layer on a support and binding them together, substantially as described.

4. The process of forming grained screens for use in photographic processes, consisting in obtaining tine filaments or fibers of transparent material and rendering the same temporarily exceedingly brittle, crushing the same to powder while brittle, sitting the grains so produced to size, ii nparting to the grains ditl'erent light selective absorption properties, distributing said grains in a layer on a support and binding them together, substantially as described.

5. The process of forming grained screens for use in photographic processes, consisting in obtaining fine filaments or fibers of transparent material and rendering the same temporarily exceedingly brittle by subjecting them to intense cold, crushing the same to powder While brittle, siftingv the grains so produced to size, imparting to the grains different light selective absorption properties, distributing said grains in a layer on a support and binding them together, substantially as described.

6. The process of forming grained screens for use in photographic processes, consisting in exposing in attenuated form a solution of collodion or celluloid to the convective action of high tension electricity, disrupting the same thereby, simultaneously volatilizing the solvent and solidifying the fixed component while inafine filamentous condition, reducing the filaments or fibers so produced to powder, sitting the grains so produced to size, imparting to the grains different light selective absorption properties, distributing said grains in a layer on a support and binding them together, substantially as described.

'7. The process of forming grained screens for use in photographic processes, consisting in forming fine filaments or fibers of celluloid or collodion out of a solution of the same, rendering the filaments or fibers so produced temporarily exceedingly brittle, crushing the same to powder while brittle, sitting the grains so produced to size, imparting to the grains different light selective absorption properties, distributing said grains in a layer on a support and binding them together, substantially as described.

8. he process of forming grained screens for use in photographic processes, consisting in forming fine filaments or fibers of transparent material out of a solution of the same, rendering the filaments or fibers so produced temporarily exceedingly brittle, crushing the same to powder while brittle, sifting the grains so produced to size, imparting to the grains different light selective absorption properties, distributing said grains in a layer on a support and binding them together, substantially as described.

This specification signed and witnessed this 21st day of April 1909.

FRANK L. DYER.

'Witnesses:

DYER SMITH, JOHN M. CANFIELD. 

